乳幼児[nyuuyouji] infants
幼い[osanai] very young
幼馴染[osananajimi] childhood friend
幼魚[yougyo] fry (young fish)
幼形進化[youkeishinka] paedomorphosis

幼子[osanago] infant
幼児[youji] infant
幼児ポルノ[youjiporuno] child pornography
幼児語[youjigo] baby talk (like choo-choo for train, etc.)
幼時[youji] childhood

花芽[kaga] flower bud
芽ぐむ[megumu] to bud
芽生え[mebae] bud
芽生える[mebaeru] to bud
芽胞[gahou] spore

御芽出度う[omedetou] congratulations!
歯芽[shiga] tooth germ
出芽[shutsuga] germination
新芽[shinme] sprout

金利鞘[kinrishou] interest margin
元鞘[motosaya] returning to normal after all is said and done
朱鞘[shuzaya] red-lacquered sword sheath
腱鞘[kenshou] sheath of tendon
腱鞘炎[kenshouen] inflammation of a tendon (sheath)

値鞘[nezaya] margin
鞘当て[sayaate] rivalry (in love, touching of sheaths)
逆鞘[gyakuzaya] (discount rate) negative spread
鞘取り[sayatori] brokerage